Removed valueType from glyphset.
More documentation; Removed vestigial valueType entries; Fixed RLE/Avro interchange issues.
 More tests.
Updated readme.
Updated readme.
Modified for (automatic) conditional spark-inclusion.
Making fast_project play with PYTHONPATH (per Jeff Baumes)
Reduced compile-time warnings (mostly related to generic types).
Removed type safety warnings (or added annotations to the ones that can't be removed)